CN1068680A - cathode ray tube - Google Patents

Abstract

A cathode ray tube relates to the improvement of the contact reed 10 and the coupling structure of the reed 10 for leading the electrons left on the fluorescent layer to the outer anode. One end of the reed 10 extends a predetermined length to form a contact portion 10a contacting the aluminum deposition layer 3b of the panel 8, and the other end of the reed 10 has a ring-shaped contact portion to contact the graphite conductive layer 2b of the funnel 2. A contact reed coupling unit is formed at the middle of the reed 10 body and one side of the frame 8 of the shadow mask frame assembly 7 . It can avoid the forming process of the graphite layer electrically connecting the aluminum layer 3b and the pin 5, and can avoid inferior products caused by blockage of the electron beam through hole of the shadow mask during the welding contact reed process, thereby improving the product yield and quality.

Description

The present invention relates to a cathode ray tube, and more particularly, to such a cathode ray tube in which the contact spring for sending the thermal electrons left on the phosphor layer to an external anode electrode is improved, and the contact spring is improved. Coupling structure of reed and cathode ray tube.

Generally, as shown in FIG. 1, a cathode ray tube has an envelope composed of a funnel 2 and a panel 3. As shown in FIG. The electron gun 4 is inserted into a neck 2a provided at the rear end of the funnel 2, and a graphite conductive layer 2b is formed on the inner surface of the funnel 2. A phosphor layer 3a is formed on the inner surface of the panel 3, and a plurality of pins 5 are arranged on the inner side of the skirt 3d at the periphery of the phosphor layer 3a. In addition, the shadow mask frame assembly 7' has a hook-shaped reed 6', and at each corner of the shadow mask frame assembly, the hook-shaped spring is coupled with a pin 5, so that the shadow mask frame assembly 7' is fixed inside the panel 3. in space. The contact spring 9 is fixed on one side of the frame 8' of the shadow mask frame assembly 7', and is in contact with the graphite conductive layer 2b of the funnel 2 with the annular contact portion at its end.

In the conventional cathode ray tube 1 constructed as above, electron beams emitted from the electron gun 4 mounted on the neck portion 2a of the funnel 2 pass through the shadow mask and fall on the phosphor layer 3a, thereby forming pixels. However, the remaining thermionic electrons remaining on the fluorescent layer 3a after the phosphor is irradiated prevent the thermal electrons continuously emitted from the electron gun 4 from falling on the fluorescent layer 3a. Therefore, the remaining thermionic electrons remaining on the phosphor layer 3 a after the phosphor is irradiated are bypassed to the common ground of the circuits of the cathode ray tube 11 .

In more detail, the remaining thermal electrons left after phosphor irradiation pass sequentially through the aluminum deposition layer on the surface of the phosphor layer, the pins electrically connected to the aluminum deposition layer, the hook-shaped reeds hooking the pins, the fixing hooks The frame of the shaped reed, the contact reed with one end fixed to the frame, the graphite conductive layer on the inner surface of the pipe cone in contact with the other end of the contact reed, and the anode electrically contacting the graphite conductive layer are bypassed To the common ground of the cathode ray tube circuit. In the unit that constitutes the path through which the thermal electrons pass, since the graphite conductive layer 3c connecting the fluorescent layer 3a, the aluminum deposition layer 3b and the pin 5 as shown in FIG. The coating, the film layer is easily detached from the skirt 3d of the panel 3 or the coating becomes uneven, which hinders the smooth passage of hot electrons. This inconsistent coating condition prevents hot electrons from passing through completely under certain circumstances. Furthermore, graphite is often sputtered onto the phosphor layer during the coating operation, making the manufactured product unusable due to the contamination of the phosphor layer with graphite. In addition, the contact spring 9 is fixed to the frame 8' by means of resistance welding, and foreign substances generated by sparks during the resistance welding remain on the shadow mask, thereby clogging the electron beam passing holes of the shadow mask.

The object of the present invention is to provide a cathode ray tube having an improved structure, wherein the conventional process for forming a graphite layer connecting an aluminum deposit and a pin is omitted, and a shadow mask which occurs when assembling a contact reed is avoided Clogging of electron beam passage holes.

In order to achieve the above and other objects of the present invention, a cathode ray tube is provided, which includes: a panel with a fluorescent layer and an aluminum layer superimposed on the inner surface of the panel, and a plurality of pins inside; a shadow mask A frame assembly having hook springs coupled to pins around the mask frame assembly; a tube cone sealed to the panel and coated with a graphite conductive layer on its inner surface; A contact reed coupled to the frame, one end of the contact reed is in contact with the graphite conductive layer of the tube cone, the cathode ray tube further includes:

A contact portion extending a predetermined length from the other end of the contact spring to be in contact with the aluminum deposition layer of the panel; and

The contact reed coupling device is arranged at the middle part of the contact reed body and one side of the frame of the shadow mask frame assembly.

These and other objects, features, aspects and advantages of the present invention will become more apparent with reference to the accompanying drawings.

FIG. 1 is a side view, partially cut away, of a conventional cathode ray tube;

Figure 2 is a schematic partial sectional view showing a cathode ray tube according to the present invention;

Fig. 3 is the separation perspective view of an embodiment of the coupling structure representing contact spring and frame among Fig. 2; And

Fig. 4 is an isolated perspective view showing another embodiment of the present invention.

In FIGS. 2 and 3, a cathode ray tube according to the present invention is formed such that a fluorescent layer 3a and an aluminum deposition layer 3b are sequentially superimposed on the inner surface of a panel 3, and a plurality of pins 5 are mounted on the periphery of the panel 3. The inner side of the skirt 3d. In addition, a mask frame assembly 7 having hook springs 6 coupled with pins 5 is installed in the inner space of the panel 3. As shown in FIG. On the inner surface of the funnel 2 sealed with the panel 3, a graphite conductive layer 2b is formed. The contact spring 10 is detachably installed on one side of the frame 8 of the shadow mask frame assembly 7 through a coupling unit. Here, the contact spring 10 has a pair of ring-shaped contact portions 10a' and 10a respectively at the ends, wherein one end (10a') is in contact with the graphite conductive layer 2b of the funnel 2, and the other end (10a) is in contact with the aluminum deposit of the panel 3. Buildup 3b contacts.

The coupling unit of the contact reed 10 includes a sheet-shaped coupling plate 10b extending from the middle of the contact reed body for a predetermined length and having an elastic protrusion 10c, and a channel-shaped coupling groove 8a formed on one side of the frame 8 corresponding to the coupling plate 10b , and the rear portion bridges the coupling groove 8a and is formed with a coupling hole 6a so as to correspond to the hook-shaped reed 6 of the elastic protrusion 10c.

Ring-shaped contact portions 10a and 10b' are preferably cut longitudinally at predetermined lengths for stable contact with graphite conductive layer 2b and aluminum deposit 3b, and elastic projections 10c are formed by pressurizing coupling plate 10b.

In the cathode ray tube formed as described above, when the coupling plate 10b of the contact spring 10 is inserted into the coupling groove 8a formed on the frame 8 of the shadow mask frame assembly 7, the elastic protrusion 10c of the coupling plate 10b is inserted into the welding In the coupling hole 6 a of the hook reed 6 of the frame 8 , the contact reed 10 is firmly coupled with the frame 8 . Therefore, clogging of the electron beam passage holes of the shadow mask caused during conventional soldering is avoided. Also, under these conditions, when the mask frame assembly 7 is coupled with the pins 5 provided on the inner surface of the panel 3 to house the mask frame assembly 7 in the panel 3, by virtue of the inherent elasticity of the material, the An annular contact portion 10a formed at the other end of the contact spring 10 at a predetermined length is in close contact with the aluminum deposit 3b on the inner surface of the panel 3. As shown in FIG. Therefore, by means of this simple coupling method of the mask frame assembly 7 with the inner surface of the panel 3, the aluminum deposition layer 3b is electrically connected to the pin 5.

In addition, as shown in FIG. 4, the same effect can also be obtained by forming a channel-shaped bent portion 6b adapted to receive the thin-plate-shaped coupling plate of the contact spring 10 and forming a spring for receiving the contact spring 10. The coupling hole 6a of the protrusion 10c. This is in place of the coupling hole 8a formed in the frame in FIG. 3 .

According to the present invention, as described above, an annular contact portion contacting the aluminum deposition layer of the panel is formed at one end of the contact spring, and the other end of the contact spring is the other end contacting the graphite conductive layer of the funnel. An annular contact portion, and the contact spring is detachably coupled to the frame by means of the coupling unit, thus eliminating the graphite deposition or coating process between the pin and the aluminum deposition layer. Thus, the aforementioned poor quality phosphor layer caused by poor deposition/coating, or sputtering of graphite on the phosphor layer, can be substantially resolved. Moreover, the coupling structure of the contact springs to the frame is simple and firm, thereby avoiding clogging of the electron beam passage holes of the shadow mask during conventional welding, thereby improving the productivity and quality of final products.

Claims (3)

1, a kind of cathode ray tube, it comprises: screen dish 3 be superimposed with fluorescence coating 3a and aluminium lamination 3b on screen inner surface, and side has a plurality of pins 5 within it; Shadow mask-frame assembly 7 has and the hook-type spring 6 that is coupled at described planar mask frame assembly described pin 5 on every side; Coil 3 sealing-ins with described screen and on inner surface, scribble the pipe awl 2 of graphite layer 2b; And contact spring 10, the framework of it and described shadow mask-frame assembly 7 is coupled, and an end of described contact spring 10 contacts with the described graphite layer 2b of described pipe awl 2,

It is characterized in that described cathode ray tube also comprises:

Contact portion 10a, it is the other end definite length extended that makes described contact spring 10, contacts with the described aluminium illuvium 3b of described screen dish 3; And

The contact spring coupling device, it is arranged on a side of the framework 8 of described contact spring 10 bodies middle part and described shadow mask-frame assembly 7.

2, cathode ray tube as claimed in claim 1 is characterized in that described contact spring coupling device comprises:

Thin slice shape coupling plate 10b, it is from the described middle part definite length extended of described contact spring body and have the 10c of elastic protrusion portion from this planar projection predetermined altitude;

Channel shape coupling slot 8a, it forms on framework one side of described shadow mask-frame assembly 7, and corresponding to the shape of described coupling plate 10b; And

Hook-type reed 6, its described channel shape coupling slot of tail end cross-over connection 8a, and form coupling aperture 6a in the somewhere that is positioned on the described cross-over connection part makes hole 6a be in the centre of described channel shape coupling slot 8a haply and corresponding to the described elastic protrusion 10c of portion.

3, cathode ray tube as claimed in claim 1 is characterized in that described contact spring coupling device comprises:

Thin slice shape coupling plate 10b, it is from the described middle part definite length extended of described contact spring body and have the 10c of elastic protrusion portion from this planar projection predetermined altitude; And

Hook-type reed 6 has the channel shape sweep 6b that is used for holding described coupling plate 10b at its tail end, and has the coupling aperture 6a corresponding to the described elastic protrusion 10c of portion on described sweep 6b.

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